Found one for you at Scan in the UK, but because of the ridiculously short supplies the prices are high...
I don't know what's going on with the GPU market ATM. You'd think, with ATI struggling to keep up with demand of it's new chips, NVidia would take this opportunity to shift a few units, but no. There's almost no stock of any high-end cards anywhere.
EDIT: Saying that, there seems to be stock of 285's in a few places now.